Stepper.h library functions

Can anybody show me what exactly execute the functions
-step.(steps);
and
-setSpeed(rpm);
from Stepper.h library ? I really want to understand what these functions do, not just write them. Thank you.

Here's the code:
https://github.com/arduino-libraries/Stepper/blob/1.1.3/src/Stepper.cpp#L172-L227

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